'use strict'

const log = require('@djun-cli/log')
const semver = require('semver')
const colors = require('colors/safe')
const LOWEST_NODE_VERSION = '11.0.0'

module.exports = class Command {
  constructor(argv) {
    if (!argv) {
      throw new Error('参数不能为空！')
    }
    this._argv = argv
    let runner = new Promise((resolve, reject) => {
      let chain = Promise.resolve()
      chain = chain.then(() => this.checkNodeVersion())
      chain = chain.then(() => this.initArgs())
      chain = chain.then(() => this.init())
      chain = chain.then(() => this.exec())
      chain.catch((err) => {
        log.error(err.message)
      })
    })
  }

  initArgs() {
    this._cmd = this._argv[this._argv.length - 1]
    this._argv = this._argv.slice(0, this._argv.length - 1)
  }

  checkNodeVersion() {
    const currentVersion = process.version
    const lowestVersion = LOWEST_NODE_VERSION
    if (!semver.gte(currentVersion, lowestVersion)) {
      throw new Error(colors.red(`djun-cli 需要安装v${lowestVersion}以上版本的 Node.js`))
    }
  }

  init() {
    throw new Error('init 必须实现')
  }
  exec() {
    throw new Error('exec 必须实现')
  }
}
